This expert quality screwdriver bit set is designed for use on cordless impact wrenches. Its shock absorbing design delivers increased torque performance that ensures screws are tightened sufficiently, but not excessively. Manufactured from S2 hardened and tempered steel. The bits are also engineered for a precise fit into screw heads, preventing wear, damage and rounding. It includes a 60mm impact rated magnetic bit holder and 30 screwdriver bits. All contents are arranged inside a sturdy plastic case with carry handle.